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Definition of caustic. 1 : capable of destroying or eating away by chemical action : corrosive The chemical was so caustic that it ate through the pipe. 2 : marked by incisive sarcasm a caustic film review caustic humor.
Use the adjective caustic to describe any chemical that is able to burn living tissue or other substances, or, figuratively, a statement that has a similarly burning effect. Caustic in this sense means harshly critical. In the chemical sense, a near synonym is corrosive.